Controller for induction-motors.



H. D. JAMES.

CONTROLLER FOR INDUCTION MOTORS.

APPLICATION FILED SEPT. 19, 1910,

' Patented Nov. 10, 1914.

VNVENTOR Y yde aA/i/ ATYORNEY my Gaby HENRY D. JAMES, OF PITTSBURGH, PENNSYLVANZ ELECTRIC AND MANUFACTUEING COMPANY, A

FKSSIGNOR, T0 WESTIN GHOUSE :fi-ATION OF PENNSYLVANIA.

CONTROLLER F63 INDUCKEICNJVZGTGRS;

Application filed September circuits thereof.

The object of my invention is to provide a controller of the character indicated for manually removing resistance from the secondary circuit of an induction motor and automatically reinserting the same therein upon interruption ofthe primary circuit.

Figure l of the accompanying drawing is a diagrammatic view of a system embodying a controller. constructed in accordance with the present invention and Fig. 2 is a similar view of-a system embodying a modification of the controller shown in Fig. 1,

The system shown in Fig. 1 comprises an induction motor .1, the primary winding of which-is adapted to be connected to a suitable supply circuit 2 34 by means of a multiple pole switch 5; fuses 6, or other suitable protecting devices, being preferably interposed between the switch and the motor. The secondary ircuit of the motor includes a plurality of resistors 8, Sand 10, suitable points of subdivision of which are connected to the stationary contact terminals 11 of a manually operated controlling ole-- vice 12, the said contact terminals being; arranged in groups which are associated, respectively, with the resistors 8, 9 and The controller has a multiplcarm rotatable member 13, that is normally retained in the position shown by means of a spring 14}, the

extremities of the arms of said member being adapted to engage the stationary contact terminals 11. When the rotatable member 13 occupies the position shownythe r;- sistors S, S) and 10 are entirely included in the secondary circuit of the motor, but, as the said member is moved in a clockwise direction, sections of the resistors are soocessively short circuitcd and are thereby, in

eil ect, removed from the secondary circuit. One arm 15 of the rotatable member 13 is provided with a lug 36 that is adapted to be f which the follow- Specification, of Letters Patent.

mend a occupies its final position, provided .the su'itca is closed; the latch 17 being here shown as a bail-crank lever, one end of which is connected, by means of a rod 18, to a second bell-crank lever 19 that is actuated to rai e the rod 18 wien the switch 5 is closed. A convenient means for actuating the bell-cranl-z lever 19, when the switch 5 is closed, consists ct rod that is moved into xi lent with one arm of the lever b closing of the switch. in order he motor, the switch is first closed 1-. oi r to connect the primary winding oi the motor to the supply circuit. Upon closing the switch 5, members 17, 18, 19 and 20 are actuated to move one end of the latch into the path ofmovement of the lug 16 of the arm 15. In order to "increase the speed oi. th motor, the rotatable member 13 of the eon-teller 12 is rotated in a clockwise direction, to gradually remove the resistors 9 audit) from the secondary circuit of the motor. llhen the movable memher 13 reaches its final position, the resistors 9 and 10 are entirely removed from the secondary circuit oi": the motor and the lug 16 is enganed'by the latch 17 If it is desired the motor, the switch 5 is whereupon the li'illCll i? releases the i the spring It? returns the rotatable memlr 13 to initial position to include al o'f-the resistors 8, 5) and 10 in the secondary uit of the motor. Thus, the present controller insures that when the mo tor is again started, the resistances 8, 9 and 10 will included in the secondary circuit of motor, and, ccnsequentiy, there will be rent to the motor.

Instead of the switch of Fig.- l, a multiple pole circuit breaker may be employed for governing the connections of the primary Winding to the supply circuit, as shown in Fig. 2, and the circuit breaker may be adapted to be opened automatically, in

the usual manner, when the motor is overloaded, or upon the occurrence of other predetermined abnormal conditions. The remainder of the system is substantially the as that shown in Fig. 1, the latch 17 icing interposed in the path of movement of the lug 1-6 only when the circuit breaker is closed, and being adapted to'automatically relase the me when the circuit breaker is him,

enga ed by a latch 1'? when the rotatable l opened.

i-Patenfted. r5 16, 191 i 19, 1910. Serial 582,558.

danger of supplying an excessive our 

